JP4650463B2 - Rotating tool and bit runout suppression member - Google Patents

Description

  The present invention relates to a rotary tool for rotationally driving a bit and a bit runout suppressing member used together with the rotary tool.

In an air driver, a bit (driver bit) whose tip is a tightening tool is attached to a spindle that is rotated by a drive unit that uses air as a power source, and the screw is tightened by rotating the bit. Is called. Here, the bit can be replaced with respect to the tool body, and even when the bit is attached to the tool body, the bit can swing to some extent with respect to the tool body. Then, in order to prevent the bit from rattling against the tool body (bit mounting hole), a steadying structure in which a rubber ring is arranged on the inner peripheral side of the tool body may be employed (see, for example, Patent Document 1).
JP 2003-89071 A

  However, when the bit is driven to rotate, the tip of the bit often shakes greatly. When the tip of the bit is greatly shaken, the work efficiency is lowered and the problem that the user of the air driver becomes tendonitis occurs.

  Therefore, a main object of the present invention is to provide a rotary tool capable of suppressing the swing of the tip of the bit and a bit swing suppressing member used therewith.

A rotary tool according to a first aspect of the present invention is a holding mechanism that holds the bit in a holding portion arranged on the base end side of the bit and can rotate together with the bit, a rotation driving mechanism that rotates the holding mechanism, A housing that accommodates the rotation drive mechanism; and a bit shake suppression member that can be attached to the housing so as to be fixed without rotating together with the bit. The bit shake suppression member is attached to the housing. In the state, it has a deflection suppressing portion arranged so that a gap can be formed between the bit and the outer peripheral surface of the bit held by the holding mechanism, and the bit driver portion rotates the bit. when initiated, it disposed extending outwardly of said bit pendulum damping member by projecting from the tip of the bit deflection suppressing member attached to the housing, the deflection suppressing portion Until the bit starts rotating due to a gap between the bit and the outer peripheral surface, the bit does not come into contact with the bit, and immediately after the bit starts rotating, there is no gap between the bit and the outer peripheral surface. When the bit is shaken, the bit is prevented from coming into contact with the bit.

In this rotary tool, the run-out suppressing portion does not contact the bit before the bit starts rotating due to a gap between the bit and the outer peripheral surface of the bit. When the bit swings until the gap disappears, it is possible to prevent the tip of the bit from swinging thereafter by contacting the bit. Therefore, the working efficiency by the rotary tool can be improved and the user of the rotary tool can be prevented from becoming tendonitis.
Further, with this rotary tool, the bit runout suppression member can be attached to the housing only when a bit runout suppression member having a runout suppression unit is required. In addition, by exchanging the bit fluctuation suppressing member, the length, inner diameter, and the like of the bit fluctuation suppressing member can be changed.

  A rotary tool according to a second aspect of the present invention is the rotary tool according to the first aspect of the present invention, wherein the runout suppressing portion is provided over the entire circumference of the bit.

  In this rotary tool, the shake suppressing portion can be easily arranged at a position where a part of the bit comes into contact immediately after the bit starts to rotate.

A rotary tool according to a third aspect of the present invention is the rotary tool according to the first or second aspect of the present invention, wherein the runout suppression portion is a gap between the bit and the outer peripheral surface immediately after the bit starts rotating. When the bit is swung until it disappears, the bit comes into contact with the bit on the bit tip side from the tip of the housing.
A rotary tool according to a fourth aspect of the present invention is the rotary tool according to any one of the first to third aspects of the present invention, wherein the runout suppressing portion is positioned between the outer peripheral surface of the bit immediately after the bit starts to rotate. When the bit swings until there is no gap, the bit comes into contact with the tip between the bit and the holding portion.
A rotary tool according to a fifth aspect of the present invention is the rotary tool according to the fourth aspect of the present invention, wherein the run-out suppressing portion is until there is no gap between the bit and the outer peripheral surface immediately after the bit starts rotating. When the bit swings, the bit comes into contact with the bit closer to the tip than the center position between the tip of the bit and the holding portion.
A rotary tool according to a sixth aspect of the present invention is the rotary tool according to any of the first to fifth aspects of the invention, wherein the bit runout suppressing member does not rotate with the bit with respect to the outer peripheral surface of the housing. It is characterized by being fixed.
A rotary tool according to a seventh aspect of the present invention is the rotary tool according to the sixth aspect of the present invention, wherein the bit runout suppressing member is fixed to the outer peripheral surface of the casing by a separate fixing member. It is said.
A rotary tool according to an eighth invention is the rotary tool according to the seventh invention, wherein the bit run-out suppressing member is fixed to the outer peripheral surface of the housing by a plurality of the fixing members. It is said.

  A rotary tool according to a ninth invention is the rotary tool according to any one of the first to eighth inventions, wherein the bit is formed with a circumferential groove as the holding portion, and the holding mechanism It has the latching member which can be engaged with a groove | channel, It is characterized by the above-mentioned.

  In this rotary tool, the configuration for holding the bit in the holding mechanism can be simplified.

  A bit run-out suppressing member according to a tenth invention is a bit run-out suppressing member for a rotary tool provided in the rotary tool according to any one of the first to ninth inventions.

  By attaching the bit runout suppressing member to the rotary tool, a part of the bit comes into contact with the runout suppressing portion immediately after the bit starts to rotate, and thereafter the tip of the bit is prevented from swinging. Therefore, the working efficiency by the rotary tool can be improved and the user of the rotary tool can be prevented from becoming tendonitis.

  In addition, in this bit swing suppression member, when the swing suppression portion is provided over the entire circumference of the bit when attached to the housing, a part of the bit comes into contact immediately after the bit starts to rotate. The shake suppressing portion can be easily arranged at the position.

  As described above, according to the present invention, the following effects can be obtained.

  In the first to tenth aspects of the present invention, the shake suppressing unit does not contact the bit before the bit starts rotating due to a gap between the bit and the outer peripheral surface of the bit, and immediately after the bit starts rotating, When the bit swings until there is no gap between the two, contact with the bit prevents the tip of the bit from swinging thereafter. Therefore, the working efficiency by the rotary tool can be improved and the user of the rotary tool can be prevented from becoming tendonitis.

  Hereinafter, embodiments of an air driver according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an air driver according to an embodiment of the present invention. FIG. 2A is a partially enlarged sectional view showing a state in which the bit and the socket are attached to the air driver. FIG. 2B is a diagram illustrating a gap between the outer peripheral surface of the bit and the inner peripheral surface of the socket. FIG. 3 is a diagram illustrating the configuration of bits. FIG. 4 is a diagram illustrating the configuration of the socket.

  As shown in FIGS. 1 and 2, the air driver 1 includes a frame 2 serving as a tool body and a lever 3 that performs an operation of rotating or stopping the bit. And from the front-end | tip 2a of the flame | frame 2, the anvil 10 used as the attachment part of a bit protrudes. Further, as will be described later, a socket 30 for suppressing bit swing can be attached to the front end 2 a of the frame 2. Here, when the socket 30 is attached to the frame 2, the socket 30 is fixed without rotating together with the bit.

  The air driver 1 includes an anvil 10 that is an attachment portion of the bit 5 and a rotation drive mechanism 20 that rotationally drives the anvil 10. The anvil 10 is a holding mechanism that holds the base end of the bit 5 and can rotate together with the bit 5. The rotational drive mechanism 20 has a spindle 21 that is rotationally driven by a drive source that uses air (not shown) as a power source, and is configured to transmit the rotation to the anvil 10.

  An attachment hole 10 a for attaching the bit 5 is formed near the tip of the anvil 10. Here, since the bit 5 has a hexagonal cross-sectional shape, the mounting hole 10 a is formed in a hexagonal shape corresponding to the outer shape of the bit 5. Further, the attachment hole 10 a is formed on the rotation axis of the anvil 10. The anvil 10 has two steel balls 11 respectively disposed in the holding hole 10b, and an operation sleeve 12 is disposed on the outer periphery in the vicinity of the tip. The two steel balls 11 are arranged so as to face each other, and can move in the holding hole 10b of the anvil 10 respectively.

  The operation sleeve 12 is rotatably attached to the outer periphery of the anvil 10, and is prevented from coming off by a retaining ring 16 and a washer 17 in the axial direction. Further, since the compression spring 18 is disposed between the operation sleeve 12 and the washer 17, the operation sleeve 12 is urged in the axial direction by the compression spring 18. In addition, a protrusion 12 a that protrudes inward at a position corresponding to the steel ball 11 is formed on the inner peripheral surface of the operation sleeve 12. Therefore, the steel ball 11 can be moved in and out of the mounting hole 10 b by being pressed by the protrusion 12 a of the operation sleeve 12. Here, the holding hole 10b of the anvil 10 is configured to prevent the steel ball 11 from coming out of the mounting hole 10a.

Further, as shown in FIG. 3, the bit 5 is a driver bit whose tip is a driver portion 5a. And in the base vicinity of the bit 5, the groove part 5b for the steel ball 11 provided in the anvil 10 to fit is formed over the perimeter. There are a plurality of types of bits 5 having different lengths. For example, there are three types of bits 5A, 5B, and 5C having lengths of 110 mm, 150 mm, and 200 mm. Here, in each bit, the total length Xa, the length Xb from the base end portion to the groove portion, and the length Xc from the tip end to the groove portion are as shown in Table 1.

  As described above, since the operation sleeve 12 is urged by the compression spring 18, the steel ball 11 is disposed at a position protruding into the mounting hole 10a by being pressed by the protrusion 12a. Therefore, in this state, if the bit 5 is inserted into the mounting hole 10 a, the steel ball 11 is retained by the groove portion 5 a of the bit 5, so that the bit 5 is prevented from coming off. On the other hand, when the operation sleeve 12 is operated in the direction opposite to the urging force of the compression spring 18, the protrusion 12a does not press the steel ball 11, and the steel ball 11 can be disposed at a position where it does not protrude into the mounting hole 10a. For this reason, in this state, the bit 5 can be inserted into or removed from the mounting hole 10a.

  As shown in FIG. 4, the socket 30 is a cylindrical member, and has a large-diameter portion 31, a medium-diameter portion 32, and a small-diameter portion 33 whose outer diameters are gradually reduced. Further, as indicated by broken lines in FIG. 4, their inner diameters are also gradually reduced. The large diameter part 31 is a part for fixing to the front end 2a of the frame 2, and is formed with a plurality of screw holes 31a extending in the radial direction. The socket 30 is fixed to the frame 2 by tightening the fixing bolt 31b disposed in the screw hole 31a in a state where the large-diameter portion 31 is set at the tip 2a of the frame 2.

  The medium diameter portion 32 has a space that can be rotated without contacting the anvil 10 in a state where the socket 30 is fixed to the frame 2. In addition, a circular opening 32 a for reducing the weight of the socket 30 is formed in the medium diameter portion 32. The small-diameter portion 33 is a portion into which the bit 5 attached to the anvil 10 is inserted and has an inner peripheral surface such that a slight gap is formed between the bit 5 and the outer peripheral surface. In addition, an elongated hole-shaped opening 33a for reducing the weight of the socket 30 is formed.

There are a plurality of types of sockets 30 having different lengths. For example, there are two types of sockets 30A and 30B having lengths of 100 mm and 60 mm. In each socket, the total length Ya and the length Yb from the tip of the socket to the groove portion of the bit when fixed to the frame 2 are as shown in Table 2. Here, in a state where the socket is fixed to the frame 2, the groove 5b of the bit 5 is disposed at a position corresponding to the center position of the opening 32a.

Incidentally, a gap having a predetermined size is formed between the outer peripheral surface of the bit 5 and the inner peripheral surface of the socket 30 as shown in FIG. Here, when the inner diameter of the socket 30 is Zamm, the maximum outer diameter of the bit 5 is Zbmm, and the minimum gap between the outer peripheral surface of the bit 5 and the inner peripheral surface of the socket 30 is Zc, the following relationship is established.
Zc = (Za-Zb) / 2
Therefore, for example, when the inner diameter Za of the socket 30 is 8.00 mm and the maximum outer diameter Zb of the bit 5 is 7.05 mm, the minimum gap Zc is 0.475 mm.

  Next, the result of the evaluation test regarding the deflection of the tip of the bit will be described. As an evaluation test, first, the bit 5B was rotationally driven with the bit 5B (150 mm) being attached to the anvil 10 without attaching the socket to the frame 2, and the deflection at the tip of the bit 5B at that time was measured. Next, with the socket 30A (100 mm) fixed to the frame 2, the bit 5B was rotationally driven, and the deflection at the tip of the bit 5B at that time was measured. Here, the inner diameter of the socket 30A was changed to three values of 7.5 mm, 7.7 mm, and 8.0 mm. Thereafter, the socket fixed to the frame 2 was changed to the socket 30B, and the bit 5B was rotationally driven, and the deflection at the tip of the bit 5B at that time was measured. Here, the inner diameter of the socket 30B was changed to three values of 7.5 mm, 7.7 mm, and 8.0 mm. In addition, the bit attached to the anvil 10 was changed to the bit 5C (200 mm), and the bit 5C was rotationally driven in a state where the socket 30A (100 mm) was fixed to the frame 2, and the deflection at the tip of the bit 5C at that time was measured. . Here, the inner diameter of the socket 30A was changed to three values of 7.5 mm, 7.7 mm, and 8.0 mm.

The results of the above evaluation test are shown in Table 3 and FIG. FIG. 5 is a diagram showing a result of an evaluation test in the air driver of FIG.

  Here, since the bit 5 having the maximum outer diameter of 7.05 mm was used in the evaluation test, the minimum gap between the outer peripheral surface of the bit 5 and the inner peripheral surface of the socket 30 when the inner diameter of each socket is changed. Is as shown in Table 3.

  In FIG. 5, the result without the socket is shown by a bold line, and the result under each condition is shown by ◯, Δ, and □. As can be seen from FIG. 5, the amplitude measurement value under each condition for which the above evaluation test was performed is significantly smaller than the amplitude measurement value under the condition without a socket (0.570 mm). That is, immediately after the rotation of the bit 5 starts, the tip of the bit 5 is displaced from the axial direction with the groove 5b as a fulcrum, so that the outer peripheral surface of a part of the bit 5 comes into contact with the inner peripheral surface of the socket 30. Thereafter, the tip of the bit 5 is prevented from shaking. Here, immediately after the rotation of the bit 5 is started, it is considered that the inner peripheral surface in the vicinity of the tip of the socket 30 is in contact with the outer peripheral surface of the bit 5, so that the inner peripheral surface in the vicinity of the tip of the socket 30 is Have a role. Therefore, in this embodiment, the shake suppression unit is provided over the entire circumference of a part of the bit 5.

  In each condition where the above evaluation test was performed, as can be seen from Table 3, the minimum gap between the outer peripheral surface of the bit and the inner peripheral surface of the socket is 0.0225 to 0.0475 mm. Then, considering FIG. 5, even when the inner diameter of the socket is further increased and the inner diameter is 8.3 mm, the amplitude measurement value is considered to be significantly smaller than the amplitude measurement value in the condition without the socket. Here, when the inner diameter of the socket is 8.3 mm, the minimum gap between the outer peripheral surface of the bit and the inner peripheral surface of the socket is 0.625 mm.

  As described above, in the air driver 1 according to the present embodiment, when the socket 30 having an inner peripheral surface that forms a slight gap with the outer peripheral surface of the bit 5 is fixed to the frame 2, the bit 5 rotates. Immediately after starting, a part of the bit 5 comes into contact with the inner peripheral surface of the socket, and thereafter, the tip of the bit 5 is prevented from shaking. Therefore, the working efficiency of the air driver 1 can be improved and the user of the air driver 1 can be prevented from becoming tendonitis.

  As mentioned above, although embodiment of this invention was described based on drawing, specific structure is not restricted to these embodiment, It can change in the range which does not deviate from the summary of invention.

  In the above-described embodiment, the inner peripheral surface in the vicinity of the tip of the socket 30 that functions as a shake suppressing portion is provided over the entire circumference of a part of the bit 5, but the member that functions as the shake suppressing portion is a part of the bit. It may be provided only on a part of the entire circumference without being provided over the entire circumference. In other words, the member having the role of the run-out suppressing portion does not come into contact with the bit before the bit starts rotating due to a gap between the outer peripheral surface of the bit, and when the bit runs immediately after the bit starts rotating, As long as the gap between the outer peripheral surface and the bit (for example, a part between the tip of the bit 5 and the peripheral groove 5b) is eliminated and the bit 5 is fixed so as not to rotate. Good. Further, the shape of the socket may be changed with respect to a portion other than the inner peripheral surface near the tip of the socket 30 having the role of the shake suppressing portion. Therefore, the socket may be formed with the same outer diameter over the whole without having a large diameter part, a medium diameter part, and a small diameter part.

  In the above-described embodiment, the air driver 1 including the rotational drive mechanism 20 having a drive source using air as a power source has been described. The same effect can be obtained with an electric tool (electric driver). That is, the rotary tool of the present invention is not limited to the air driver 1 and may be any rotary tool that rotates the bit.

  When a rotary tool such as an air driver is used for a long time, the deflection of the tip of the bit is often increased as compared with a new rotary tool. This is because wear due to repeated rotation increases the gap between the anvil's outer diameter and the bit becomes unstable against the anvil, and the shape of the mounting hole of the anvil deforms due to wear during insertion and removal of the bit and load during rotation ( This may be caused by damage. Here, it is considered that the effect of the present invention can be obtained not only in a new rotary tool but also in a rotary tool that has been used for a long time.

  If this invention is utilized, while working efficiency with a rotary tool improves, it can prevent that the user of a rotary tool becomes tendonitis.

It is a perspective view of an air driver concerning an embodiment of the invention. FIG. 2A is a partially enlarged sectional view showing a state in which the bit and the socket are attached to the air driver. FIG. 2B is a diagram illustrating a gap between the outer peripheral surface of the bit and the inner peripheral surface of the socket. It is a figure which shows the structure of a bit. It is a figure which shows the structure of a socket. It is a figure which shows the result of the evaluation test in the air driver of FIG.

1 Air Driver 2 Frame 5 Bit 5b Circumferential Groove 10 Anvil 11 Steel Ball 20 Rotation Drive Mechanism 30 Socket

Claims (10)

A holding mechanism that holds the bit in a holding portion disposed on the base end side of the bit and is rotatable with the bit;
A rotational drive mechanism for rotationally driving the holding mechanism;
A housing that houses the rotational drive mechanism;
A bit swing suppression member that can be attached to the housing so as to be fixed without rotating together with the bit,
The bit shake suppressing member has a shake suppressing portion disposed so that a gap can be formed between the bit swing suppressing member and the outer peripheral surface of the bit held by the holding mechanism in a state of being attached to the housing. ,
Driver unit of the bit, when the rotation of the bit is started, is arranged extending outwardly of said bit pendulum damping member by projecting from the tip of the bit deflection suppressing member attached to the housing ,
The deflection suppressing portion does not contact the bit before the bit starts to rotate due to a gap between the bit and the outer peripheral surface of the bit, and immediately after the bit starts rotating, between the outer peripheral surface of the bit and the bit. When the bit is swung until there is no gap, the rotary tool comes into contact with the bit to suppress the bit from swinging.   The rotary tool according to claim 1, wherein the runout suppression unit is provided over the entire circumference of the bit.   When the bit swings until there is no gap between the bit and the outer peripheral surface immediately after the bit starts to rotate, the shake suppression unit moves the bit from the front end of the housing to the bit front side. The rotary tool according to claim 1, wherein the rotary tool is in contact with the rotary tool.   When the bit swings until there is no gap between the bit and the outer peripheral surface immediately after the bit starts to rotate, the swing suppression unit moves the bit between the tip of the bit and the holding unit. The rotating tool according to claim 1, wherein the rotating tool is in contact with the rotating tool.   When the bit swings until there is no gap between the bit and the outer peripheral surface immediately after the bit starts to rotate, a center position between the tip of the bit and the holding unit The rotary tool according to claim 4, wherein the bit contacts the bit at a more distal end side.   The rotary tool according to claim 1, wherein the bit run-out suppressing member is fixed so as not to rotate together with the bit with respect to an outer peripheral surface of the casing.   The rotary tool according to claim 6, wherein the bit run-out suppressing member is fixed to the outer peripheral surface of the housing by a separate fixing member.   The rotary tool according to claim 7, wherein the bit run-out suppressing member is fixed to the outer peripheral surface of the housing by a plurality of the fixing members. The bit has a circumferential groove as the holding portion, and
The rotary tool according to claim 1, wherein the holding mechanism includes a locking member that can be engaged with the circumferential groove. A bit run-out suppressing member for a rotary tool provided in the rotary tool according to claim 1.

Images